They are playing volleyball over there They are cleaning their classroom 对划线部分提问
题目
They are playing volleyball over there They are cleaning their classroom 对划线部分提问
答案
1.What are they doing over there?
2.What are they doing?
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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